Change of a date from a mirror column (date)

I wish that from a mirror column where the date shows (from a mirror item), we can modify the date of another column:
when date (of mirror column) changes to X, then put date of column (non mirror column) to date x

Hi @Florian22630 , I think you won’t be able to use mirrored columns on automations. Have you tried having the same item live on multiple boards to achieve your desired automation?